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Kana Kurosaki has been appointed to be in charge of investigating the serial killer X. However, there is little information about X, not only his name but also his entire background is unknown, and there is not even a proper photo of him. Kana's father, Goro, who was once a special investigator, also worked hard to investigate X, but lost his life in the line of duty. Kana visits Eiji Kagami, a former subordinate of her father's and the man closest to X, and asks for his cooperation in the investigation. However, this Eiji Kagami is X. Kagami becomes interested in Kana and uses medicine to take away her consciousness...